In this unit, students will discover that shapes are identified and described by their defining attributes of sides, corners (vertices), edges, and faces. The first five lessons name a variety of shapes by their special (defining) attributes. Lessons six through eight will focus on identifying shapes of different sizes and orientations by using special (defining) attributes. Finally, students will build shapes according to their special (defining) attributes using concrete materials in the final two lessons. Students will have prior knowledge of sorting objects by their nondefining attributes (e.g., color and size) so they are likely to struggle with using only defining attributes to identify and describe shapes.
Key Concepts:
 Shapes have names that are based on their attributes, and three of these shapes are squares, circles, and triangles.
 The name of a shape is invariant with regard to its orientation or size.
 We can use various components to model shapes in the real world.
Prior Knowledge Needed:
 Ability to count, sort, and categorize objects; (Grade K, Unit 3; K.MD.B.3)
 Ability to use spatial reasoning to informally describe the shapes of objects and the relative position of objects; (Grade K, Unit 3; K.G.A.1)
Units on the Horizon:
 Classifying two and threedimensional shapes (Grade K, Unit 11)
 Modeling and composing shapes (Grade K, Unit 15)
 Distinguishing attributes of shapes (Grade 1, Unit 7)
Lessons

Lesson objective: Students will understand that shapes have names based on their defining attributes. Students bring prior knowledge of informally describing the shapes of objects and the relative position of objects from K.G.A.1 in Unit 3. This prior k...

Lesson objective: Practice naming rectangles and hexagons based on their defining attributes. This lesson helps to build procedural skills with naming shapes based on their defining attributes. Shape images are used here because the defining attributes ...

Lesson objective: Name and describe shapes, including cubes and spheres, based on their defining attributes. This lesson helps to build procedural skills with naming shapes based on their defining attributes. Images of cubes and spheres are used here be...

Lesson objective: Nameand describe shapes, including cylinders and cones, based on their defining attributes. This lesson helps to build procedural skills with naming shapes based on their defining attributes. Images of cylinders and cones are used here...

Lesson objective: Apply knowledge of the defining attributes of shapes to describe and identify shapes. This lesson provides an opportunity for students to apply their knowledge and understanding of defining attributes to a reallife situation. Students...

Lesson objective: Understand that the name of a shape is determined by its defining attributes and that nondefining attributes such as position, color or size do not change the name of the shape. Students bring prior knowledge of defining attributes fr...

Lesson objective: Identify the defining attributes of shapes to tell how shapes are the same. This lesson helps to build procedural skills with naming and identifying shapes. Images of shapes of different sizes and orientations are used here because the...

Lesson objective: Apply understandings of the attributes of shapes by using defining attributes, not shape size or orientation, to identify and name shapes. This lesson provides an opportunity for students to apply their knowledge and understanding of t...

Lesson objective: Understand that we use what we know about the defining attributes of shapes to build shapes with materials. Students bring prior knowledge of defining attributes from K.G.A.1 and K.G.A.2. This prior knowledge is extended to building sh...

Lesson objective: Apply understandings of special shape attributes to build shapes with materials. This lesson provides an opportunity for students to apply their knowledge and understanding of defining attributes to a reallife situation. Students are ...